Camouflage has been used by the military for decades but like a chameleon, it needs to adapt to changing environments.
In a bid to prepare for future warfare, the Royal Marines' support arm has been working on its urban camouflage as part of the Commando Logistic Regiment's annual validation exercise.
The regiment provides the support to keep the Royal Marines sustained in battle, so it is vital they keep supplies and equipment hidden.
Exercise Green Dragon is putting their skills to the test at the southern edge of Dartmoor at Lee Moor quarry.
The focus is on escaping detection by drones - ensuring an operator is unable to spot any objects as targets.
With the correct camouflage, a state-of-the-art field hospital complete with surgical facilities can appear to be just another building.
Surgeon Commander Ed Allcock said:
"Our concern is that medical facilities seem to have been targetted in a lot of recent conflicts, so we're looking at ways to keep them safer.
"One of those is to provide camouflaging and effectively hide them in plain sight.
"The idea being it could be deployed to an urban site and not be picked up by aerial photography or surveillance."
The Commando Logistic Regiment is at five days to notice to deploy worldwide.